I have used a Funcube Dongle, RTL Stick and most recently the SDRPlay RSP for 2m DXing. Both the RTL dongle and the SDRPlay RSP allow me to see the whole 2MHz of 144MHz, or normally more usefully, the whole of the DX end of the band. The station configuration is the same for any of these SDRs.

Transceive operation with the station rig, an IC746. Simon HB9DRV's SDRConsole V3 software controls the frequency of the SDR and the Icom via CIV. So if I turn the tuning knob on the Icom the SDR VFO follows.

Click on a signal in the panoramic display the rig jumps to that frequency.

Additional and comprehensive IF filtering and demodulation provided by SDR-Radio.

I've been using this setup during openings on 2m in the past couple of years and it has been completely reliable. Instead of constantly tuning up and down around the calling channel I can see signals the moment they appear. Just click, the Icom jumps to the frequency and pounce! There are several nice QSOs in the log as a result of spotting DX calling CQ away from 144.300 that I am sure I would have missed without SDR.